How are Topics created?

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We take the entire citation network – over 1.5 billion citation links between 59+ million Scopus-indexed documents from 1996 forward and an additional 24+ million non-indexed documents that are cited at least twice – and indexed and non-indexed publications from before 1996 – and break that network into roughly 94,000 Topics. A Topic is created where the linkages within the Topic are strong and the linkages outside the Topic are weak. Only the indexed documents are included in Topics.